Ante Handlers

The fees module presently has no transaction handlers of its own, but does expose the special AnteHandler, used for performing a validity check on a transaction, such that it could be thrown out of the mempool. The AnteHandler can be seen as a set of decorators that check transactions within the current context, per ADR 010.

Note that the AnteHandler is called on both CheckTx and DeliverTx, as Tendermint proposers presently have the ability to include in their proposed block transactions which fail CheckTx.

Decorators

The fees module provides the following AnteDecorator:

• MinFeeDecorator: Checks if the tx fee is greater or equal to the minimum fee amount computed looking the messages present inside the transaction itself.